Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/vidyfoo/antigravity-skill-engine/doc-writingnpx skills add VidyFoo/antigravity-skill-engine --skill doc-writinggit clone --depth 1 https://github.com/VidyFoo/antigravity-skill-engineWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vidyfoo/antigravity-skill-engine/doc-writing)<a href="https://agentmods.dev/skills/vidyfoo/antigravity-skill-engine/doc-writing"><img src="https://agentmods.dev/badge/skills/vidyfoo/antigravity-skill-engine/doc-writing.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00037 | $0.00483 |
| Opus 5 | $0.00018 | $0.00242 |
| Sonnet 5 | $0.00007 | $0.00097 |
| Haiku 4.5 | $0.00004 | $0.00048 |
Grade A, and why
doc-writing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Documentation Engineering
Purpose
Code tells you how. Documentation tells you why and what. We treat documentation as an engineering artifact: structured, versioned, and maintained.
When to Use This Skill
- New Project: "Write a README."
- Knowledge Transfer: "Explain how this works."
- API: "Document this endpoint."
- Handover: "Create a user guide."
Core Framework: Diátaxis
Classify your document into one of four quadrants to ensure clarity.
- Tutorials (Learning-oriented): A lesson to get a beginner started.
- Example: "Build your first Todo App in 5 minutes."
- Tone: Inspiring, step-by-step, no choices (follow me).
- How-to Guides (Problem-oriented): A recipe to solve a specific problem.
- Example: "How to reset your password."
- Tone: Practical, concise, steps 1-2-3.
- Reference (Information-oriented): Technical description of machinery.
- Example: "User API Class Specification."
- Tone: Dry, accurate, complete.
- Explanation (Understanding-oriented): Context and background.
- Example: "Why we chose Rust over C++."
- Tone: Discursive, theoretical.
Google Style Guide Highlights
- Voice: Active, not passive. ("Click the button", not "The button should be clicked").
- Second Person: Speak to "you" (the user).
- Simplicity: Use short sentences and plain language.
Resource Files
| Topic | File |
|---|---|
| Framework Deep Dive | diataxis.md (Understanding the 4 types) |
| README Standard | readme-template.md (The Gold Standard) |
| Style Checklist | style-guide.md (Writing rules) |
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 47 lines · 37 tokens per session scan A d16c4d849727
doc-writing is a skill published in the GitHub repository VidyFoo/antigravity-skill-engine (12 stars, last pushed yesterday), licensed MIT. It adds 37 tokens to every session and 483 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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